SMP technology: a challenge for silanes

摘要

Silane-modified polypropyleneoxides (SMPs) or MS polymers~(~R) offer a wide range of physical properties and can be formulated into a variety of moisture-curable adhesives and sealants. Silane additives greatly influence the performance of MS polymer~(~R) adhesives and sealants and play a key role in the success of these products. The paper outlines silane chemistry and the preparation and characterization of a low-modulus MS polymer~(~R) sealant. The impact of various aminosilane adhesion promoters on the sealant's shelf life, cure rate, physical properties, and dry and wet adhesion is reviewed. Oligomeric diaminosilanes such as VPS 1146 silane offer multifunctionality, a low volatility, and a reduced amount of volatile organic comounds (VOC) to the formulator. An increase in elongation and a decrease in modulus of the MS polymer~(~R) sealant is realized. Primerless adhesion generated by VPS 1146 silane outperforms commonly used monomeric aminosilanes due to better wetting/film formation.